Home > php教程 > php手册 > php中数组的搜索程序代码

php中数组的搜索程序代码

WBOY
Release: 2016-05-25 16:55:20
Original
1188 people have browsed it
在php中简单数据搜索很简单我们直接使用in_array() 函数在数组中搜索给定的值即可,这种是简单的一维数据

 代码如下 复制代码

$people = array("Peter", "Joe", "Glenn", "Cleveland");

if (in_array("Glenn",$people))
  {
  echo "Match found";
  }
else
  {
  echo "Match not found";
  }
?>

输出:

Match found。

array_key_exists()函数
如果在一个数组中找到一个指定的键,函数array_key_exists()返回true,否则返回false。其形式如下:


1 boolean array_key_exists(mixed key,array array);

下面的例子将在数组键中搜索apple,如果找到,将输出这个水果的颜色:

 

 代码如下 复制代码

1 $fruit["apple"] = "red"; 

2 $fruit["banana"] = "yellow"; 

3 $fruit["pear"] = "green"; 

4 if(array_key_exists("apple", $fruit)){ 

5     printf("apple's color is %s",$fruit["apple"]); 

6 }

执行这段代码得到的结果:


1 apple's color is red


array_search()函数

 代码如下 复制代码

$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$founded = array_search("green", $fruits);
if($founded)
 printf("%s was founded on %s.",$founded, $fruits[$founded])

array_keys()函数

 代码如下 复制代码

$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$keys = array_keys($fruits);
print_r($keys);

上面的方法都只能搜索一维数据,如果是多维数据就没办法了。


1 php搜索多维数组的键值

如下面例子:

 代码如下 复制代码

$foo[1]['a']['xx'] = 'bar 1';
$foo[1]['b']['xx'] = 'bar 2';
$foo[2]['a']['bb'] = 'bar 3';
$foo[2]['a']['yy'] = 'bar 4';
$foo[3]['c']['dd'] = 'bar 3';
$foo[3]['f']['gg'] = 'bar 3';
$foo['info'][1] = 'bar 5';

如果要查找 bar 3 怎么进行查找呢。有三个结果,而这三个结果都要,看下面的函数:
-------------------------------------------------------------------------------------------------------------------------------

 代码如下 复制代码
function array_search_re($needle, $haystack, $a=0, $nodes_temp=array()){
global $nodes_found;
$a++;
foreach ($haystack as $key1=>$value1) {
    $nodes_temp[$a] = $key1;
    if (is_array($value1)){  
      array_search_re($needle, $value1, $a, $nodes_temp);
    }
    else if ($value1 === $needle){
      $nodes_found[] = $nodes_temp;
    }
}
return $nodes_found;
}

---------------------------------------------------------------------------------------------------------------------------------
这个函数就可以把上面要查找到的内容全部返回出键名来

 代码如下 复制代码

$result = array_search_re('bar 3', $foo);

print_r($result);

输出结果为如下:
Array ( [0] => Array ( [1] => 2 [2] => a [3] => bb )
          [1] => Array ( [1] => 3 [2] => c [3] => dd )
          [2] => Array ( [1] => 3 [2] => f [3] => gg )
        )

1 php搜索多维数组的键名

 代码如下 复制代码

function array_search_key($needle, $haystack){
global $nodes_found;

foreach ($haystack as $key1=>$value1) {
 
 if ($key1=== $needle){
 
  $nodes_found[] = $value1;
      
   }
    if (is_array($value1)){  
      array_search_key($needle, $value1);
    }
  
  
}

return $nodes_found;
}
$result = array_search_key('a', $foo);

print_r($result);

输出结果为如下:
 

Array
(
    [0] => Array
        (
            [xx] => bar 1
        )

    [1] => Array
        (
            [bb] => bar 3
        )

    [2] => Array
        (
            [yy] => bar 4
        )

)

通过遍历我们可以实现多维数据搜索了。



教程链接:

随意转载~但请保留教程地址★

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template